Rock-drill.



No. 839,586. PATENTED DEC. 25, 1906.

G. BAYLES.

ROCK DRILL.

APPLICATION rum) MAY 31. 1904 H. HELLMAN & L.

3 SHEETS-SHBET 1.

No. 839,586. PATENTED DEC. 25, 1906. v

H. HBLLMAN & L. C. BAYLES.

ROCK DRILL. APQLIOATIQN FILED MAY 31. 1904.

3 SHEETS-SHEET 2.

No. 839,586. PATENTED DEC, 25, 1906. H. HELLMAN & L. C. BAYLES.

BOOK DRILL.

APPLIOATION FILED MAY 31, 1904.

3 SHEETS-SHEET 3 err-tree rare orrros.

Specification of Letters Patent.

rammed Dec. 2 5, 1906.

Application ind May 31, 1904. semi No. 210,510.

To all z" it may concern? Be it n that we, HENRY HELLMAN and LE1" is Cox nicr Barres, citizens of the United residine at Johannesbur 5 TZ&IlSz '8"l, haveinvcnted certain new and useful Em "ovements in Roclr-Drills, of which the following a specification.

This invention consists of improvements in anc in connection with rock-drills or rockdrilling machines employed in mines, (narries, and the like for the formation of oles for blasting or breaking therock by explosive charges.

It relates more particularly to that class of drill or machine used for small and-comparatively short holes or such as are re uired for stopingt plugand-feather, or like work.

The 1110139 important objects of our invention are, first, to provide alight drill capable of drilling holes of the required size and depth and one which will be so simple and durable in construction as not to require the constant attention of a skilled mechanic; secondly, to

provide mechanism whereby, the cutting-tool or hit is revolved or rotated at the same time that it is advanced; thirdly, to provide a drilling-machine which will cease to operate operator or runner fails to keep the ma cl ed Iorward as fast as the bit cuts into 0 the rock; fourthly, to provide a mechanism by means of which the drillingmachine may be set the desired distance from the workl ugh the column upon which it be separated from the workg or lesser distance, varyrtain limits, and, fifthly, to prcsupply cl. water or air the bore-hole at or in cuttin =race of the hit to aldust created when the ma" "to operation and for siour the machine put out of oplhose several objects are attained wns oi the improvements hereinafter ihe improvements constituting the pres ent invention will now be described in detail by aid of the accompanying drawings,, wherein- Figure 1 i 'strates the machine in longitunal ct-i1 i conjunction with the means t on the column, shaft-bar, or

is a sectional end ele- I ii ing off the water or air vation of Fig. 1 on line X X. Fig. 3 is an elevation, partly in section, of the machine, illustrating the means for controlling the sup ply of water or air to be injected into the bore-hole Fig.4 is a section of a part of the front portion of the machine shown in Fig.3 drawn to an enlarged scale.

Similar characters of reference indicate the same 01 correspondin parts in the several a figures of the drawings.

The machine comprises the power-cylinder .A, which is slidably mounted in an outer cylindrical casing B. The front end of the cylinder A extends beyond the front end of the protecting-casing B, in the end of which casing B isprovided a cap or bushing b, which fits loosely around the cylinder A. The cap 5 maybe screwed into the forward end of the casing B, as shown,. or be otherwise firmly secured thereto, so as to act as a support and guide for the power-cylinder A. At the rear end of the power-cylinder A, inside the casirw B, is located a valve box or chest (1. The vs vs arrangement illustrated in Fig. 1 is the same as that used in an axial valve chippingor riveting machine, of which a represents the axial valve and e the valve box or chest. Any other suitable construction of valve motion may be employed in place of that shown in the drawings. The working cf'the valve shown is well understood.

a? represents the port by which the motive fluid enters the rear end of the powencylinder A, and c represents the ort by which the motive fluid enters the ot icr or forward end of said cylinder, and c represents the exhaust-port. These ports are controlled by means of the valve 0/ to alternately admit the motive fluid to either side of the iston C, which is thereby reciprocatcd insi e the power-cylinder A. The pistonO may be of any form adapted to the valve motion and arrangement of ports. Fig. 1 shows a suitable standard design of piston C p The feed-screw c, which serves for feeding the drilling-bit forward as the hole deepens, works through a feed-nut c. The feed-nut 0 may be either constructed as shown similar to a reducing pipe-coupling and be screwed or otherwise secured round the outside of the rear end of the casing B or it take the form of a bushing fitted and secured in the rear end of said casing.

The inner end of thefeedescrew c, inside the casing B, is rigidly fixed in a boss formed on the end of the valve-box cap a The feed-screw c is hollow and communicates with the interior of the valve-chest a and serves for introducing the motive fluid into it. The end of the feed-screw may, instead of being attached to the valve-box cap, be secured to the cylinder A; but we'prefer the ariangement shown and described. The feed screw 0, working through the nut 0, acts as a support for the rear end of the power-cylinder A.

The power-cylinder A, fitting loosely the cap or bushing 1;, permits the motive fluid exhausting througilh the port a, to escape from the interior of t e casin B.

On the outer end 0 the feed-screw c is formed an annular projection or shoulder 0 On the feed-screw, in rear of the shoulder 0 is arranged a swivel D, from which the motive fluid passes into the interior of the hollow feeding-screw a through the a erture d. The end of the feed-screw c beyon the end of the swivel D is formed with an external screwthread. Over the end of the feed-screw c is screwed a crank 0 which serves for rotating the feeding-screw c to screw it through the feed-nut c to move the drill forward or backward.

c c are packing-rings between the shoulder 0 and the swivel D and between the swivel and the crank 0 'Over the outer extremity of the feedingscrew 0 is screwed a cap 0, which closes the end of the feed-screw c and serves to retain the crank c and swivel D in position on the end of the screw 0. The motive fluid may be led'into the swivel D and thence into the hollow feeding-screw c by means of a hose or other suitable pipe fixed on the screwed portion d of said swivel. The connection between. the hose and the swivel maybe fitted with a valve M for regulating the admission of the motive fluid to the machine.

The feed-screw 0 being connected to the valve-box cap a o advances or recedes the valve-box a and with it the power-cylinder A and drilling-bit E, according to the direction of rotation of the crank 6'. same time as the forward extremity of the feed-screw c is rigidly attached in the valvebox cap the cylinder and with it the drill-bit are rotated in unison withthe screw (3. I

In the forward end of the power-cylinder A and beyond the port a is placed what we may designate a (shank-cap F. At the end of its forward stroke the piston C strikes or impinges upon the inner end of the shankcap F, which in turn transmits the force of the blow to the drill steel or bit E. In the front of the shank-cap F is formeda recessf, into which rojects the inner extremity of the shank o the bit E. The' enlarged front cylindrical portion f of the shank-cap F works in a -.ounterbore f 2 in the forward end At the' of the power-cyiinder A, while the rear cylindrical portion f works in another counterbore f 4 in the power-cylinder.

Into the forward end of the cylinder A is screwed or otherwise secured a cap G, and

inside the cylinder A, next the cap G, is arranged a rubber or other suitable buffer g.

Protecting-rings g g are arranged in the power-cylinder A at either side of the rubber but? er g. The drill-bit E reciprocat es through .7 5

the protecting-rings g g andbufier g into the. 8

recess f in the shank-cap F'. Should the drill E from any cause perm it the shank-cap F to ,be pushed forward by the piston C sufficiently far, it will come into contact with the protectin -rin so that the bufier 9 will rec z: a g 9 ceive the blow.

It will be obvious that the hole in the cap G and the part 9' of-the drill-shank may be made of any polygonal section, triangular or of other form, instead of square to insure the 5 rotation of the drill-bit E with the cylinder A, or the drill-bit may be fixed in the end of the cylinder by means of a key or pin and slot to obtain the same result.

In. the wall of the cylinder inlet-port a is formed a port e, over which the inner end of the shank-cap F isnormally seated, so that said port is closed the bit. is kept fed up to its work. If the cut ting extremity of the drill-bit E is not in con- I0 5 tact with or close to the rock when the piston C strikes the shank-cap F, the cap F will be driven forward against the buffer 9 and will be followed up by the piston C. The shankcap F will then uncover the port e and permit 1 IO the motive fluid admitted into the cylinder A through the port. a to leave the cylinder by the port 6. This will prevent the'piston 0 being moved in its rearward. or back stroke,

and the machine will thereupon cease to op- 1 15 crate until such time as the shank-cap F is pushed backward or the machine fed forward to cause the S111 nk-cap F to overlap the guilt;

e and close it, whereupon the motive acting on the forward end of the piston will we propel it on its rearward stroke and the machine be again brought into operation.

The outer cylinder or casing B is securely mounted on a column, shaft-bar, or other suitable support- H.

h is a .c'iamp of ordinary construct-ion secured tothe column H and adtpted to reeciye the cone It, to which is suited the split sleeve 72? The sleeve h is shaped to fit the casing and the ends of the sleeve air tight 130 so that when the power-cylinder A is A beyond the so long as 7 split sleeve'h as may be desired.

ened by means of a bolt 21 By tightening the bolt 11 the sleeve 7L2 clamps and securely .holds the protecting-casing B, and by slackening the bolt h and releasing the sleeve 71.

the protecting-casing B is thereby freed and' or range of feed provided the column is setwithin a foot of the correct distance from the working face. With the present method of mounting drills any variation from the correct distance between the column and working face shortens the available feed by that amount.

In the working of rock-drills is often im possible to set the column at precisely the desired distance from the rock-face, and the operator is frequently compelled to change the bit after drilling only a short distance, and it not infrequently becomes necessaryto take down and reset the column before drilling the secondhole, as the rock-face projects slightly where the second hole is tojhe started or a bit short as is necessary is not obtainable. This difficulty is obviated by the -method of mounting above described.which' permits the drill to be easily advanced toward or withdrawn fromthe working face.

in Figs. 3 and 4 we illustrate; in conjunction with the drill, the means for providing a water or air supply at or in proximity to the extremity of the drill-bit to allay or remove the dust or pulverized rock created when the machine is running. In these views the part o f of the shank-cap F is located and Works in leakage reversing the piston.

the bore of the cylinder A and the supplyport of and exhaust-port e open irto the bore of the cylinder and not into a counterbore, as shown and described with reference to Fig. 1. In this case the piston C will overrun and close the port a when the drill-bit E is not kept up against the rock and the shank-cap F is driven forward.- When the piston C overruns the port a l, there will be some leakage around the piston C and the bore of the,

cylinder A, which in the case of a worn piston or cylinder will be suflicientto return the piston on the back stroke, and so open the port (1. The port a will permit the l'ree escape of any air which may leak front the port (1 around the piston C, and so prevent the ()n the forward 0nd of the power-cylinder A is screwed a piece J whichforms a counterbore in which the large endf of the shank-cap F is located. j is a packing-ring between the headj" of the slm11k-cap F and the end of the cylindhr A. A swivel or loose collar K is arranged round the piece J and secured thereon between the shoulder on the one side and .a

nut is and lock-nut k screwed on the piece J, at the other side of the swivel K. Fr represents packings'round the piece J at either side of the swivel. it is an annular recess formed round the inside of the swivel, and k represents three (more or less) holes formed in the wall of the piece J, communicating with the annular recess k and placing the chamber between the head f of the shank cap F and the protecting ring g in communication with the recess is". G is the cap screwed into the forward end of'the piece J,

and g' the packing and buffer ring, which is fitted with protecting-rings g g at each end and forms a ractically water-ti ht joint round-the shan of the drill. To t e swivel 'or loose collar K is attached a valve-box L.

In the valve-box L is arranged a valve Z, which on the one side works against a spring l. The valve-box L is connected to a source of water or air supply by a pipe M. The valve-box L is also connected with themotive Q fluid supply pipe preferably between the valve N and the point of admission of the fluid tothe machine by means of a pipe n. The pi e n communicates with. the valve-box L on t is opposite side of the valve l, so that the motive-fluid pressure works against the spring Z. When the valve N is operated to admit the motive fluid to the machine, the fluid passes along the pipe n and operates the valve Z to allow the water to ass out of the pipe M through the valve Z and along the passage k in the swivel to the annular recess 7c and thence throu h the holes k into the chamber in frontof the shank-cap lj, whence it passes into the shank of the drill-bit E, through the hole m, and along the longitudinal hole m" in the drill-bit E to emerge at or near the cutting end thereof. So long as the Z is placed in compression; but when the supply 18 out off and the machine put out of operati'onthe spring Z reverses the valve 1 and soshut-s off the water-supply.

Z and are ports for permitting the escape of Water from the front of the piston Z.

motive-fluid supply is maintained thespring Instead of attaching the valve-box L directly to the swivel K it may be located at any other con-' venient point in the water-supply pipe M and be connected to the swivel or loose collar K by means of a pipe. r What weclaim as our invention, and desire to protect by Letters Patent, is

1. In a rock-drill, in combination, a powercylinder, a protecting-casing in whichjthe power-cylinder is slidably fitted, a reciproeating piston arrangedin the cylinder, means fitted in the forward end of t e cylinder for supporting thrdrill-bit so that the same has longitudinal movement in said means, means for rotating the drill-bit in unison with the power-cylinder, and means ,for advancing or receding the power-cylinder in its protectingcasing', substantially as described.

2. In a rock-drill in combination, a powerward stroke, means for supporting the drill-- porting the power-0y inder, a' reciprocating piston arranged in said power-cylinder, a shank-cap fitted in the forward end of said power-cylinder, means for supporting the drill-bit in the forward end of the cylinder and for rotating same in unison therewith, means for introducing the motive fluid into the cylinder, said means serving to advance or re-' cede the power-cylinder in its protecting-casing, and a split sleeve embracing the protecting-casing adjustable longitudinally thereof, substantially as described.

3. In a rock-drill, in combination, a protecting-casing, a power-cylinder, a reciprocating piston fitted in the interior thereof, means for introducing the motive fluid into the cylinder, said means serving to support the rear end of the cylinder and for advancing and receding the cylinder in its protecting-casing, means for supporting the protecting-casing adjustable longitudinally thereof, a shankcap fitted in the forward end of the cylinder which serves to receive and transmit the blow of the piston to the drill-bit on the forbit in the forward end of the cylinder and for compellin the bit torotate in unison with said cylin er, substantially as described.

4. In arock-drill, in combination, a powercylinder, a reciprocating piston 'working therein, a valve-box and valve fitted on or in the rear end thereof, a protecting-casin in which the cylinder is slidably mounted, a ollow feed-screw, a cap or cover fitted on the rear end of the protecting-casing through which the feed-screw works to advance or recede the power-cylinder, said hollow feeding-.

screw serving to lead the motive fluid into the valve-box, means for rotating said feeding-screw, and means for introducin the motive fluid into the screw, substantia ly as described.

5. In a rock-drill, in combination, a powerc linder, a reciprocating piston workin therein, a piston arranged and adapted to reciprocate in said cylinder, a shankcap fitted in the forward end of the cyl inder which serves for receiving and transmitting the impact of the piston to the drill-bit, means fitted in the forward end of the cylinder for supporting the drill-bit and for compelling it to rotate in unison with the power-cylinder, a hollow feed-screw which serves for introducing the motive fluid into the cylinder and for advancing and receding the power cylinder in its supporting-casing, means for rotating the feeding-screw, means for introducing the motive fluid into the" screw, and means for supporting the drill adjustable longitudinally of the protecting-casing, substantially asdescribed.

6. In a rock-drill, in combination, a owercylinder, a reciprocating piston fitted t erein,

. a portion means for reoi rocating said piston, ashankcap fitted in t e forward end of the powen cylinder for receiving and transmittingthe? impact of the piston to the drillin bit on the forward stroke, a cap fitted to t e forward end of the power-cylinder for supportin the shankof the drill-bit and shaped internafiy to compel thadrill-bit to rotate in unison with the power-cylinder while ermitting the drillbit to move longitudinal y of the axis of the power-cylinder, substantially as described.

7. In a rock-drill, in combination, a powercylinder, a reciprocating piston, means for alternately admitting the motive fluid to either side of said piston, a shank-cap fitted in the forward end of the power-cylinder for receiving and transmitting the impact of the piston to the drilling-bit on the forward stroke, means for supporting the shank of the drillbit in the extremity of the cylinder beyond the shank-cap, an escape-port formed in the power-cylinder which is normally closed by the shank-cap and which ort permits the free escape of any motive uid entering the forward end of the cylinder should the shankcapbe moved forward by the piston owing to the drilling-bit not being kept fed up to its work to throw the machine out of operation, substantially as described.

8. In a rock-drill, in combination, a powercylinder A, a reciprocating iston C fitted therein, means for admitting t e motive fluid to either side of said piston, a slidin shankcap vI fitted in the forward end of t e cylinder and formed with an enlarged front portionf, a cap G fitted in the end of the powercylinder A formed with a polygonal hole through the center, a drill-bit E formed with of its shank of polygonal section corresponding with the hole in the cap G and the extremity of circular section against which the enlarged front ortion f of the shank-cap is adapted to stri e, and means for rotating the power-cylinder A and with it the drill-bit E, substantially as described.

9 In a rock-drill, in combination, a powercylinder A, a piston C arranged therein, -a s ank-cap F fitted in the front of the cylinder A to receive and transmit the-impact of the piston C to the drill-bit E on t e forward stroke, the bower-cylinder having an escapeport e which permits the motive fluid to escape from the front of the piston in the event of the shank-cap being moved forward owing to the drilling-bitnot being kept fed up to its work, a cap G fitted in the forward extremity of the cylinder A formed with a central hole g of polygonal sectioma'drill-bit E'i'ormed' with a portion 9 of polygonal section corresponding to the hole 9 and an elastic acking-ring g fitting round the cylindrica part of the shank inside the ca G and acting as a buffer to the shank-cap substantia ly as described. p

10. In a rock-drill, in cbmbinatiomfa ceases power-cylinder A, a reciprocating piston C, a shank-cap F, a drill-bit E the shank of which is shaped to compel it to rotate with the cap G in which it is supported, a cap G, acasing B, on )S e b fitted at the ends thereof, a hollow fee screw 1: working through the cap 0 to advance or recede the drill and to rotate the bit in unison with the cylinder A, a swivell) for'introduci'ng the motive fluid into the feed-screw c, and means for rotating the screw 0, substantially as described.

11. In a rock-drill, in combination, a power-cylinder A, a reciprocating piston C iitted therein, a shank-cap F, the power-c l- 'mder having an escape-porte in the cylin or A normally closed by the shank-cap, a ca G fitted in 'the forward end of the power-0y inder, 8. drill-bit E formed with a part 9 of polygonal section fitting the cap G, and a cyindrical part rejected into a recess f in the front of the s ank-cap, a feed-screw 0 communicating with the rear end of the cylinder, a casing B supporting the cylinder A, a cap 0 through which the feed-screw 0 works, a swivel Dt'or introducing the motive fluid into the hollow feed-screw, means for rotating the feed-screw to advance or recede the power cylinder A and to rotate the same and with it the drill-bit E, a split sleeve k adjustable longitudinally of the casing B and means for mounting the drill, substantially as described.

12. In a rock-drill, a power-cylinder, a re I ciprocatlng piston therein, means for operating said piston by compressed fluid, a dril tool having its shank extending into a chamber within the cylinder and having a longitudinal bore communicating by a transverse passage with said chamber, a shank-ca lo- Gated between the piston and shank of the drill-tool, said shank-cap Being adapted toreceive the impacts of the piston and to transmit same to the drill-tool, said shank-cap being constructed with an enlargement at its .forward end, and means-consisting of a, resilient and relatively stationary packing-ring located at the rear of and next the head or annular enlargement on the shank-cap in conjunction with which it operates to revent the passage of the water from the c amber into the bore of the cylinder beyond said chamber, and means for'supplying water to said chamber, substantially as described.

13. In a :rock-drill, in combination, a pow'ermylinder, a protecting-casingin which the cylinder is slidably mounted, means for advancing and receding the power-cylinder in the casing, means for supportin the drillbit in theiorward extremity-of t e power cglindersaid means insuring the rotationof t e bit inunison with the power-cylinder, means for receiving and transmitting the impact of the piston to the'shank of the drillsteel, a chamber formed round the shanlrof the drill-steel, a swivel or loose collar in com munication with said chamber, means for supply when the motive-fluid L and for cutting off. the water or when the motive fluid is shut oil,

preventing the water or power-cylinder, means niultaneously l. oil the we 7::

off, substantially as described.

14. In a rock-drill, in combination, power-cylinder, an extensiompiece J secured on the end thereof, a shank-cap F titted in the forward end of the power-cylinder, an enlar ementj", a packing 7' between the part of t .e shank-cap and the end of the power-cylinder, a swivel K formed with the annular recess 7c, holes k in the piece J placing the interior of the piece J in front of the shankcap in communication with the recess it, means for introducing water or air into the interior of the swivel when the motive-fluid supply is admitted to the machine, means for 8 5 simultaneously shutting off the water or air supply when the motivefluid supply is shut. oil, a drill-bit, means for supporting the shank thereof in the forward end of the piece J the drill-steel being formed with a lcngitudinal hole and with a hole placing longitudinal hole in communication with cham her in front of the'shank-cap for introducing a jet of water or air at or in proximity to the cuttin end of the drill substantially as describe r 15. In a rock-drill, in combination, a ower-cylinder A, a she -cap F fitted in the 'orward end thereof formed with the enlar ement or head j" and recessed to receive tne Ioo extremity of the drill-shank, a packing 5' between the sh'anlecap and the end of the cylinder, a piece J fined on the forward end of the cylinder, a swivel K in communication with the piece J in front of the shankcap', a 1-05 valve-box L and springcontrolled valve Z arranged therein for admittin water or air to the chamber in front of the s sank-cap when the motive fluid is admitted to the machine air sup ly no means or introducing water or air to the valve-box L, a cap G fittedjn the front end of the iece J for supporting the drill-bit and comps Ii it to rotate in unison with the ,ow'encylin er, m 5

the drill-bit being formed with holes in cornmunication with a longitudinal hole formed therein placing the chamber in front of the she -cap in communication with'saidlongitudinal hole for introdiicing a jet of water or air at or in proximity to the cutting end of the bit, substantiall as described.

16. In a roc drill, in combination, a power cylinder, a protectin casingi surroundin the cylinder in whic the cy inder 12 5 is slidab y mounted, means for introducing the motive fluid to-the cylinder, said means serving for advancing or receding the cylinder in the casin means for supporting the ca adjustab e longitudinally thereof, a x 0 shank-cap fitted in the forward end of the cylinder, an escape-port controlled by said shank-cap adapted to permit the motive fluid to esca e from the front of the piston should the s ank-cap be moved forward by the piston sufficiently far to uncover sai port, a swivel surrounding the forward end of the cylinder, means for introducing, the

water or air into a chamber formed in frontpower-cylinder, an adjustable split sleeve k and means for mounting the drill, a shankcap F and the port e controlled thereby, an extension-piece J on the forward end ofthe power-cylinder, a swivel arranged round the piece J communicating with the chamber formed in the front of the shank-cap, a cap G fitted in the front of the piece J and the packing 9 inside the piece J beyond the cap G, a drill-bit E with the part 9 of polygonal section to fit the hole g in the cap G and the cylindrical part projectin throu h the acking g and abutting the out o the s ankcap, the holes in the drill-bit communicating with the 'chamber in front of the shank-cap, a water or air supply pipe communicating with the swivel. K, a valve-box L between the swivel and said air or water supply pipe, a spring-controlled valve Z and a pipe N placing the valve-box L in communlcation with with the power-cylinder, the drill-bit. formed with a longitudinal hole placed in communication with the chamber in front of the shank-cap, and a packmg'surroundmg said shank to prevent the water or air escaping round the shank, substantially described. 17. In a rock-drill, in combination, a ower-cylinder A and its supporting-casing the motive-fluid-supply pipe so that the valve l is operated to admlt the water or air supply to the swivel when the motive fluid is admitted to the power-cylinder, substantially as described.

In witness whereof we have hereunto set our hands in the presence of two subscribing a reciprocating piston C, a feed-screw c r and feed-nut c forming the cover of the casing B, a swivel l) for admitting the motii'e fluid to thefeed-Screw 0, means for rotating said feed-screw to advance or rec-ode the witnesses.

HENRY HELLMAN. I LEWIS CONDICT BAYLES. Witnesses:

CuAs. OvisNnALE, R. OVENUALE. 

